I've been watching a tutorial on youtube on how to make a mob. The code I made seems to have no errors, but when I try to use the new spawn egg I get an error. Game does not close.

2013-12-14 14:43:19 [WARNING] [Minecraft-Server] Skipping Entity with id 301
2013-12-14 14:43:20 [iNFO] [sTDERR] java.lang.reflect.InvocationTargetException
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityList.createEntityByID(EntityList.java:205)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:175)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:81)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.item.ItemStack.tryPlaceItemIntoWorld(ItemStack.java:153)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.item.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:434)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.network.NetServerHandler.handlePlace(NetServerHandler.java:556)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.network.packet.Packet15Place.processPacket(Packet15Place.java:79)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.network.MemoryConnection.processReadPackets(MemoryConnection.java:89)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.network.NetServerHandler.networkTick(NetServerHandler.java:141)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.network.NetworkListenThread.networkTick(NetworkListenThread.java:54)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.server.integrated.IntegratedServerListenThread.networkTick(IntegratedServerListenThread.java:109)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:691)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:587)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:129)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
2013-12-14 14:43:20 [iNFO] [sTDERR] Caused by: java.lang.NullPointerException
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at mods.danilafe.frozenworld.mob.MobNecromancer.applyEntityAttributes(MobNecromancer.java:19)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityLivingBase.<init>(EntityLivingBase.java:193)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityLiving.<init>(EntityLiving.java:85)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityCreature.<init>(EntityCreature.java:40)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at net.minecraft.entity.monster.EntityMob.<init>(EntityMob.java:19)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	at mods.danilafe.frozenworld.mob.MobNecromancer.<init>(MobNecromancer.java:12)
2013-12-14 14:43:20 [iNFO] [sTDERR] 	... 20 more

According to this, the game crashes because my main mob class (MobNecromancer) needs something passes down to it, a world. It is nowhere in the tutorial and nothing in his video crashes. What am I doing wrong?

Hi

 

Show us your MobNecromancer?  Something in your MobNecromancer.applyEntityAttributes is probably attempting to use an object that hasn't been initialised yet.

 

-TGG

 

package mods.danilafe.frozenworld.mob;

import mods.danilafe.frozenworld.FrozenWorld;
import net.minecraft.entity.EnumCreatureAttribute;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.monster.EntityMob;
import net.minecraft.world.World;

public class MobNecromancer extends EntityMob{

public MobNecromancer(World par1World) {
	super(par1World);
	this.experienceValue = 0;
}
protected boolean isAIEnabled(){
	return true;
}
public void applyEntityAttributes(){
                super.applyEntityAttributes();
	this.getEntityAttribute(SharedMonsterAttributes.followRange).setAttribute(40.0D);
	this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setAttribute(0.70D);
	this.getEntityAttribute(SharedMonsterAttributes.attackDamage).setAttribute(1.0D);
	this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setAttribute(40.0D);
}
protected void entityInit(){
	this.getDataWatcher().addObject(12,Byte.valueOf((byte)0));
	this.getDataWatcher().addObject(13,Byte.valueOf((byte)0));
	this.getDataWatcher().addObject(14,Byte.valueOf((byte)0));
}
protected void dropRareDrop(int par1){
	switch(this.rand.nextInt(3)){
	case 0:
		this.dropItem(FrozenWorld.WinterPlant.itemID, 1);
	}
}
public EnumCreatureAttribute getCreatureAttribute(){
	return EnumCreatureAttribute.UNDEFINED;
}
public void onLivingUpdate(){
	super.onLivingUpdate();
}
}

 

The thing is, in the stacktrace, when you click the java:12 ( the very LAST thing) it jumps me to " super(par1World);"

Apparently all of the .setAttribute lines cause a crash

 

EDIT

 

 

WAIT

I forgot to add the super. Noticed it myself. It still crashes;

java.lang.reflect.InvocationTargetException
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityList.createEntityByID(EntityList.java:205)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:175)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:81)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.item.ItemStack.tryPlaceItemIntoWorld(ItemStack.java:153)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.item.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:434)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.network.NetServerHandler.handlePlace(NetServerHandler.java:556)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.network.packet.Packet15Place.processPacket(Packet15Place.java:79)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.network.MemoryConnection.processReadPackets(MemoryConnection.java:89)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.network.NetServerHandler.networkTick(NetServerHandler.java:141)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.network.NetworkListenThread.networkTick(NetworkListenThread.java:54)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.server.integrated.IntegratedServerListenThread.networkTick(IntegratedServerListenThread.java:109)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:691)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:587)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:129)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
2013-12-14 16:39:32 [iNFO] [sTDERR] Caused by: java.lang.NullPointerException
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.DataWatcher.updateObject(DataWatcher.java:148)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityLivingBase.setHealth(EntityLivingBase.java:829)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityLivingBase.<init>(EntityLivingBase.java:194)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityLiving.<init>(EntityLiving.java:85)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.EntityCreature.<init>(EntityCreature.java:40)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at net.minecraft.entity.monster.EntityMob.<init>(EntityMob.java:19)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	at mods.danilafe.frozenworld.mob.MobNecromancer.<init>(MobNecromancer.java:12)
2013-12-14 16:39:32 [iNFO] [sTDERR] 	... 20 more

Hmmmm

 

 

beats me what's going on.  If it were me, I'd place a breakpoint in your constructor

	public MobNecromancer(World par1World) {
	super(par1World);
	this.experienceValue = 0;
}

and then trace into super, EntityLivingBase.setHealth etc until I could figure out which vble is null (and hopefully - why)

 

If there's an obvious error, I'm not seeing it.

 

-TGG

Yeah, i went throught looking for missing “super”s and found that out. Thanks!